Based on Grant Morrison and Darick Robertson’s graphic novel, Happy! centers on Nick Sax (Meloni), an intoxicated, corrupt ex-cop-turned-hitman who is adrift in a world of casual murder, soulless sex and betrayal. After a hit gone wrong, his inebriated life is changed forever by a tiny, relentlessly positive, imaginary blue winged horse named Happy (Oswalt, who replaced the originally cast Bobby Moynihan).